Alright, so my trainer got me on a routine for 2 weeks. He set the Machines I'm supposed to use, how much weight on each machine and 4 reps each.....Basically I do..
2 reps of 25 crunches on ab roller
cardio for 20 mins
2 reps of each weight machine
2 reps of 25 crunches on ab roller
cardio for 20 mins
2 reps of each weight machine
I have found that when I do my rouns on the weight machine...I get to the last machine and my arms just will not function and I can't finish my last rep, or sometimes not even the first.
Am I starting with too heavy of weights? Should I be doing it in the evening after I've eaten plenty? I usually do it in the morning after breakfast. I really feel like a weakling when this happens...but I know I'm not.
Help!

I do love it....I just hate it when I'm doin it....especially the shoulder press...that thing KILLS me! 
That is how I've lost 30 lbs in 5 weeks! 